Private equity firm Thoma Bravo and a Canadian teacher pension say they will pay about $3.6 billion to take Riverbed Technology private a couple months after the computer networking equipment maker promised a thorough review of its business.

The San Francisco company says its stockholders will receive $21 in cash for each share from Thoma Bravo and the Ontario Teachers' Pension Plan. That represents a 12 percent premium to the stock's Friday closing price.

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Riverbed Technology Inc. said in October that its board would review ways to enhance shareholder value, and it planned to cut costs by up to $25 million.

Riverbed shareholders and government regulators still need to approve the deal, which is expected to close in the first half of next year.